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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d04facc8d77a9fe22c68d69fc20d694d0c2ec7a99fd4f94d71dbe5f0dc2f9b7' 
  AND token = 'YzhA8pyKJYwhMlAKWctvCMABZX+Ajz1NbDBt0Q+MOoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}